ak4368 AKM Semiconductor, Inc., ak4368 Datasheet - Page 31

• Manufacturer Part Number: ak4368
• Description: Dac With Built-in Pll & Hp-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
The cut-off frequency of the headphone-amp output depends on the external resistor and capacitor used. Table 23 shows
the cut off frequency and the output power for various resistor/capacitor combinations. The headphone impedance R
16Ω. Output powers are shown at AVDD = 2.4, 3.0 and 3.3V. The output voltage of the headphone is 0.47 x AVDD
(Vpp) @−3dBFS.
DACHL, LINHL, MINHL, DACHR, RINHR and MINHR bits set the path, respectively. When the HPG bit is “0”(R
100k), the gain is +0.76dB(typ) for all paths. When HPG bit is “1”(R
MS0529-E-00
R [Ω]
6.8
16
0
LIN/RIN pin
MIN pin
C [µF]
DACL/DACR
220
100
100
100
47
47
Table 23. Relationship of external circuit, output power and frequency response
Figure 23. Summation circuit for headphone amp output (HPG bit = “0”)
BOOST=OFF
fc [Hz]
MINHL/MINHR bit
DACHL/DACHR bit
LINHL/RINHR bit
100
149
106
45
70
50
Figure 22. External Circuit Example of Headphone
HP-AMP
AK4368
100k(typ)
100k(typ)
R
BOOST=MIN
1
fc [Hz]
17
43
28
78
19
47
100k(typ)
R
−
+
- 31 -
C
2.4V
20
10
5
1
R
= 50k), the DAC path gain is +6.76dB(typ).
Headphone
2
HPG=0, 0dB
16Ω
Output Power [mW]
3.0V
31
15
8
−
+
HP-Amp
1.09R
2
3.3V
38
18
9
HPG=1,
−4.8dB
HPL/HPR pin
3.3V
50
25
13
[AK4368EG]
2006/07
L
1
is
=